#include<cstdio>
#include<iostream>
#include<cstring>
#include<unistd.h>

int main()
{
  //库函数
  printf("hello printf\n");
  fprintf(stdout,"hello fprintf\n");
  const char *s = "hello fwrite\n";
  fwrite(s,strlen(s),1,stdout);

  //系统调用
  const char *ss = "hello write\n";
  write(1,ss,strlen(ss));

  //
  fork();
  return 0;
}
